コード例 #1
0
    def create(self, path, mode):
        self.files[path] = dict(st_mode=(S_IFREG | mode),
                                st_nlink=1,
                                st_size=0,
                                st_ctime=time(),
                                st_mtime=time(),
                                st_atime=time())

        name = path
        mode = self.files[path].get('st_mode')
        ctime = self.files[path].get('st_ctime')
        mtime = self.files[path].get('st_mtime')
        atime = self.files[path].get('st_atime')
        nlink = self.files[path].get('st_nlink')
        size = self.files[path].get('st_size')
        uid = os.getuid()
        gid = os.getgid()
        self.chown(path, uid, gid)
        # get free block for the new created file to save the metadata.
        num_array = Format.get_free_block(Format, 1)
        block_num = num_array[0]
        # set up the location in the disk
        inode_data = Format.set_inode(Format, name, mode, ctime, mtime, atime,
                                      nlink, uid, gid, size, block_num)
        disktools.write_block(block_num, inode_data)
        # update the free block bitmap
        Format.update_bit_map(Format, num_array)

        self.fd += 1
        return self.fd
コード例 #2
0
    def mkdir(self, path, mode):
        self.files[path] = dict(st_mode=(S_IFDIR | mode),
                                st_nlink=2,
                                st_size=0,
                                st_ctime=time(),
                                st_mtime=time(),
                                st_atime=time())
        name = path
        mode = self.files[path].get('st_mode')
        ctime = self.files[path].get('st_ctime')
        mtime = self.files[path].get('st_mtime')
        atime = self.files[path].get('st_atime')
        nlink = self.files[path].get('st_nlink')
        size = self.files[path].get('st_size')
        uid = os.getuid()
        gid = os.getgid()
        self.chown(path, uid, gid)
        # get free block for the new created file to save the metadata.
        num_array = Format.get_free_block(Format, 1)
        block_num = num_array[0]
        # set up the location in the disk
        inode_data = Format.set_inode(Format, name, mode, ctime, mtime, atime,
                                      nlink, uid, gid, size, block_num)
        disktools.write_block(block_num, inode_data)
        # update the free block bitmap
        Format.update_bit_map(Format, num_array)

        # find the parent path and add the nlink by 1.
        parent_path = Format.find_parent_path(Format, path)
        self.files[parent_path]['st_nlink'] += 1
        Format.update_nlink(Format, parent_path, 1)
コード例 #3
0
    def write(self, path, data, offset, fh):
        self.data[path] = (
            # make sure the data gets inserted at the right offset
            self.data[path][:offset].ljust(offset, '\x00'.encode('ascii')) +
            data
            # and only overwrites the bytes that data is replacing
            + self.data[path][offset + len(data):])
        self.files[path]['st_size'] = len(self.data[path])

        # get the length of input data
        size = len(self.data[path])
        # calculate the number of blocks that need to store the data
        no_of_blocks = (size // BLOCK_SIZE) + 1
        # get the free blocks
        num_array = Format.get_free_block(Format, no_of_blocks)
        Format.clear_data_block(Format, path)
        # set the data block bitmap
        data_block_bitmap = Format.set_data_block_bitmap(Format, num_array)
        # get the input data
        input_data = self.data[path]

        # save the data to disk into the allocated blocks
        for i in range(no_of_blocks):
            if no_of_blocks == 1:
                disktools.write_block(num_array[i], input_data)
            else:
                disktools.write_block(num_array[i],
                                      input_data[i * 64:i * 64 + 64])
        # Add the data block bitmap into the metadata information
        Format.update_file_location(Format, path, data_block_bitmap)
        # update the st_size in the metadata
        Format.update_size(Format, path, self.files[path]['st_size'])
        # update the st_mtime in the metadata
        Format.update_mtime(Format, path, int(time()))
        # update the free block bitmap
        Format.update_bit_map(Format, num_array)

        return len(data)